Core Value
The NiCr 8020 Resistance Heating Coils for Furnaces are premium spiral heating elements engineered for high-temperature thermal processing systems, heat treatment furnaces, ceramic kilns, and vacuum ovens. Formulated with high-purity 80% Nickel and 20% Chromium (Ni80Cr20 / Chromel A Equivalent) alloy, these coiled resistance elements form an adherent, protective chromium oxide (Cr₂O₃) surface layer when exposed to heat, preventing internal oxidation and structural degradation.
Designed for maximum continuous operating temperatures up to 1200°C (2192°F), NiCr 80/20 provides superior hot-strength and creep resistance compared to FeCrAl alloys, preventing coil sagging and distortion during prolonged thermal cycles. Featuring long cold-tail terminal extensions for secure electrical passthrough, these custom-coiled elements deliver stable electrical resistance and high surface load performance. BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE and UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS for guaranteed electrical uniformity and zero-defect furnace reliability.
- ✓ Extreme Temperature & Creep Resistance: Performs continuously up to 1200°C (2192°F) with high structural rigidity, eliminating coil sag under high thermal stress.
- ✓ Self-Healing Protective Oxide Layer: Forms a dense chromium oxide scale that prevents atmospheric corrosion and thermal oxidation decay.
- ✓ Non-Magnetic Properties: 100% non-magnetic Nickel-Chromium matrix ensures stable electrical properties and uniform magnetic field dynamics inside induction or sensitive process chambers.
- ✓ Long Cold-Tail Terminal Design: Straightened terminal leads keep electrical connections cool at furnace wall passthroughs, reducing terminal burnout risks.
- ✓ Superior Ductility & Weldability: Retains elasticity and ductility even after extensive heating cycles, making maintenance, repair, and terminal welding simple.
- ✓ Custom Coil & Wire Geometries: Precision wound to exact outer diameters (OD), coil pitch, wire gauge (AWG/mm), and overall length specifications.
- ✓ Reliable Quality: 30+ YEARS MANUFACTURING EXPERIENCE guarantees precise wire drawing, uniform coiling pitch, and exact resistance per meter.
- ✓ Quality Assured: UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS including cold resistance checks, dimensional tolerance checks, and hot insulation testing.
- ✓ Global Compliance: CE, RoHS, ISO 9001, and ISO 14001 certified.
Technical Specifications & Performance Data
| Parameter | Standard Value | Customizable Range | Notes |
| Alloy Composition | Ni80Cr20 (80% Nickel, 20% Chromium) | Ni70Cr30 / Custom NiCr Alloys | Equivalent to Kanthal NIKROTHAL 80 / Chromel A |
| Max Working Temp | 1200°C (2192°F) Continuous | Up to 1250°C short peak | Superior resistance to high-temp oxidation |
| Wire Diameter | Ø 1.0 mm – Ø 8.0 mm | AWG 20 to AWG 0 / Custom Gauges | Precision drawn for uniform resistance |
| Coil Outer Diameter (OD) | Ø 10 mm – Ø 150 mm | Built to ceramic tube / groove ID | Calculated coil pitch to prevent turn-to-turn shorting |
| Resistivity (20°C) | 1.09 ± 0.05 μΩ·m | Standard NiCr 80/20 resistivity | Stable electrical resistance under thermal cycling |
| Density | 8.40 g/cm³ | High nickel density matrix | High thermal mass and mechanical durability |
| Melting Point | 1400°C (2552°F) | Physical property | Broad safety margin above working temperature |
| Cold Lead Terminals | Straightened Double/Single Wire Tails | Twisted 2-wire / 3-wire welded tails | Keeps furnace wall penetration cool |
| Warranty | 1 Year Standard | Extended coverage available | Guaranteed against manufacturing defects |
Industrial Applications & Solutions
- Heat Treatment Furnaces: Primary heating coils for carburizing, annealing, hardening, and stress-relieving batch and continuous furnaces.
- Ceramic & Glass Kilns: Spiral heating elements mounted on ceramic support tubes or laid inside refractory grooved brick walls.
- Radiant Tube & Ceramic Bobbin Elements: Internal coil cores inserted into alloy radiant tubes and ceramic bobbin cores for indirect heating.
- Vacuum & Atmosphere Furnaces: Non-magnetic heating coils used in protective argon, nitrogen, or vacuum heat-treating environments.
- Aluminum & Non-Ferrous Metallurgy: Melting pots, holding furnaces, and die casting thermal units requiring high-wattage radiation.
HT-Heater vs Standard Market Heating Coils
| Feature | HT-Heater NiCr 8020 Coils | Standard Market Coils | Your Advantage |
| Alloy Purity & Sintering | 100% Virgin Melt Ni80Cr20 Alloy | Recycled Nickel / Impure Scrap Melt | Zero localized hot spots or premature wire burnouts |
| Coil Pitch Uniformity | Precision CNC Automatic Coiling | Manual / Irregular Pitch Coiling | Prevents short-circuiting between adjacent spiral turns |
| Creep Strength | High Hot Structural Integrity | Softens / Sags below 1000°C | Maintains horizontal and vertical alignment inside kilns |
| Ductility After Use | Remains Ductile & Weldable | Becomes Brittle & Cracks | Easy maintenance and terminal repairs after thermal cycles |
| Manufacturing Exp. | 30+ YEARS EXPERIENCE | Unverified Workshops | Engineered coil pitch ratio and surface load calculation |
| Quality Assurance | MULTIPLE RIGOROUS QUALITY CHECKS | Basic Resistance Check Only | ZERO DEFECT DELIVERY |
Installation & Integration Guidelines
- Coil Stretch Ratio Inspection: When installing compressed spiral coils, stretch the heating coil uniformly to achieve a pitch of 2 to 3 times the wire diameter to ensure even thermal dissipation and prevent adjacent turn touching.
- Support Tube & Groove Clearance: Ensure ceramic support tubes or refractory brick grooves are thoroughly cleaned of metallic debris, slag, or carbon soot before installing new coils.
- Cold-Tail Terminal Passthrough: Extend the straightened cold-lead terminals fully through the furnace insulation wall. Use ceramic insulator sleeves to isolate terminals from metallic outer furnace casings.
- Solid Mechanical / Welded Joints: Connect cold tails to external power busbars using heavy-duty mechanical screw clamps or TIG/Arc welding. Never soft-solder furnace terminal leads.
- Initial Commissioning Bake-Out: Ramp up new heating coils gradually to 300°C to bake off any handling oils, then hold at 800°C for 1 hour to establish a continuous chromium oxide protective skin.
Customer Success Stories
Case 1:
Industrial Kiln Manufacturer (Germany)
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Application: Ceramic support tube spiral heating coils for high-temperature sintering kilns operating at 1150°C.
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Challenge: Previous FeCrAl coils sagged and short-circuited against furnace brickwork during continuous horizontal operation.
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Solution: NiCr 8020 Resistance Heating Coils with custom coil pitch and heavy-gauge wire.
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Results: COIL SERVICE LIFE EXTENDED BY 2.5X. “The hot strength of HT-Heater’s NiCr 8020 is remarkable—zero sagging even after months of 1150°C operation. HT-Heater UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS, and electrical resistance accuracy is spot on.”
Case 2:
acuum Heat Treatment Plant (USA)
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Application: Non-magnetic heating elements inside high-vacuum annealing furnaces.
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Challenge: Magnetic field interference and premature wire brittleness with lower-grade alloy coils during rapid cooling cycles.
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Solution: Ni80Cr20 Custom Spiral Heating Coils with twisted cold-tail terminals.
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Results: MAINTENANCE DOWNTIME REDUCED BY 80%. “30+ YEARS MANUFACTURING EXPERIENCE is visible in their coiling quality. Coils stay completely ductile after cooling, making element swapping fast and easy.”
Pricing & Procurement Options
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Standard Production: MOQ 5 kg (Wire) or 10 pieces (Pre-coiled elements). BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE ensuring exact spooling, coiling pitch, and resistance repeatability. Tiered volume discounts available for 50+ coil orders.
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Lead Times: Standard Coil Diameters & Gauges: In stock, 3-5 days. Custom Spiral OD, Special Pitch, or Welded Terminal Runs: 7-10 days. Express air shipping available for furnace emergency repairs.
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Global Logistics: Coils packed in custom protective foam slots or wooden export crates to prevent bending or coil deformation during transit.
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Sample Orders: Custom sample coils manufactured upon CAD drawing or electrical resistance specification approval. Every shipment UNDERGOES MULTIPLE RIGOROUS QUALITY CHECKS prior to dispatch.
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Global Certifications & Compliance
- CE Marking
Fully compliant with European safety and environmental standards. - LVD Compliance
Low Voltage Directive tested for continuous thermal load safety. - RoHS Compliant
Constructed using environmentally safe, lead-controlled brass alloys. - ISO 9001
Certified quality control covering CNC machining, coil pressing, and electrical testing.
Quality Documentation: Certificate of Conformity (COC) and insulation resistance test reports included.
Comprehensive After-Sales Support
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- Warranty: 1-Year Comprehensive Warranty covering internal heating element and built-in sensor.
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Technical Support: Application engineers available for wattage distribution calculation, thermocouple calibration, and nozzle fitting assistance.
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Global Response Network: BACKED BY 30+ YEARS MANUFACTURING EXPERIENCE with technical inquiry feedback within 2 hours.
Ready to Optimize Your Injection Molding?
Next Steps:
- 📧 Request Custom Quote – Send your nozzle dimensions, wattage, voltage, and HT-CLW-450 drawing requirements.
- 🔧 Free Design Consultation – Work with our thermal engineers to optimize heat distribution and lead insulation.
- 📦 Order Test Samples – Evaluate thermal performance on your injection molding machine.
- 📞 Contact Hot Runner Experts – Response within 2 hours
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